Dance at an unvarying pace? (3-4)

I believe the answer is:

one-step

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'dance' is the definition.
(I know that one-step is a more specific form of dance)

'at an unvarying pace?' is the wordplay.
'at' says to put letters next to each other.
'an' becomes 'one'.
'unvarying pace?' becomes 'step' (pace is a kind of step. I am not sure about the 'unvarying' bit.).
'one'+'step' is 'ONE-STEP'.

Can you help me to learn more?

(Other definitions for one-step that I've seen before include "Foxtrot's precursor" , "Vigorous dance" , "Style of foxtrot" , "(Very short?) ballroom dance" , "Kind of foxtrot" .)

I've seen this clue in the Evening Standard.

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